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Diffstat (limited to 'lib')
| -rw-r--r-- | lib/CodeGen/README.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/README.txt b/lib/CodeGen/README.txt index 4fff15c1e3..8767191320 100644 --- a/lib/CodeGen/README.txt +++ b/lib/CodeGen/README.txt @@ -143,3 +143,8 @@ load [T + 7] ... load [T + 15] //===---------------------------------------------------------------------===// + +It's not always a good idea to choose rematerialization over spilling. If all +the load / store instructions would be folded then spilling is cheaper because +it won't require new live intervals / registers. See 2003-05-31-LongShifts for +an example. |